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Bug
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    Resolution: Done
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P3: Somewhat important
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    5.4.0, 5.5.0
 
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        3ee01f74031d9e1d0aad0bdf699e0a4ff5e288ba, 820e69d6c214f95e6db101c6e7caf28b0a248c69, 391741bd7b9d07a6c3fd2e5c0bc70d3c00f29ac8
 
Run the example from QTBUG-42314. Open and close the combobox dropdown a couple of times.
From time to time a warning like the following will be printed:
QNSView mouseDragged: Internal mouse button tracking invalid (missing Qt::LeftButton)